Question

Which of the following is true regarding dihybrid crosses?

	A.	Each parent involved in the cross is heterozygous for at least one of the two genes being assessed.
	B.	Two gene loci are assessed and the parents can be any genotype at these two loci.
	C.	There are 9 different fertilization possibilities.
	D.	The ratio 9:3:3:1 means that of the possible outcomes in offspring; 9/16 will express the dominant phenotype for both loci, 3/16 will express the dominant phenotype for the first locus and the recessive phenotype for the second locus, 3/16 will express the recessive phenotype for the first locus and the dominant phenotype for the second locus, and 1/16 will express the recessive phenotype for both loci.
	E.	The ratio 9:3:3:1 indicates there will be 9 individuals that are homozygous dominant for both loci assessed.

Answer 1

I believe the correct answer to be:

Option D) The ratio 9:3:3:1 means that of the possible outcomes in offspring; 9/16 will express the dominant phenotype for both loci, 3/16 will express the dominant phenotype for the first locus and the recessive phenotype for the second locus, 3/16 will express the recessive phenotype for the first locus and the dominant phenotype for the second locus, and 1/16 will express the recessive phenotype for both loci.

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